diff --git a/main.c b/main.c
index 0b6b52d..ee1e687 100644
--- a/main.c
+++ b/main.c
@@ -81,8 +81,23 @@ volatile uint8_t frame_count = 0; /**< number of frames passed */
 #define MUX_S2_PORT B /**< port to select multiplexer output */
 #define MUX_S2_PIN 5 /**< pin to select multiplexer output */
 
+/** number to be display and changed using the buttons */
+struct number_t {
+	uint16_t number; /**< number to display (0-9999, 0xffff=off) */
+	uint8_t up; /**< which of the 16 buttons is to increment the number */
+	uint8_t down; /**< which of the 16 buttons is to decrement the number */
+};
 /** episode, scene, take, video 1, audio 1, video 2, audio 2 number (does not have to be in this order) */
-uint16_t numbers[7] = {0};
+struct number_t numbers[] = {
+	{0, 2, 3},
+	{0, 14, 15},
+	{0, 10, 11},
+	{0, 6, 7},
+	{0, 1, 0},
+	{0, 13, 12},
+	{0, 5, 4},
+};
+
 
 #define POWER_SWITCH_PORT B /**< port to switch power of all devices (including this micro-controller) */
 #define POWER_SWITCH_PIN 8 /**< pin to switch power of all devices (including this micro-controller) */
@@ -498,10 +513,10 @@ void main(void)
 	// display numbers on TM1637
 	for (uint8_t number=0; number<LENGTH(numbers); number++) {
 		mux_select(number);
-		if (0xffff==numbers[number]) {
+		if (0xffff==numbers[number].number) {
 			led_tm1637_off();
 		} else {
-			led_tm1637_number(numbers[number]);
+			led_tm1637_number(numbers[number].number);
 		}
 	}
 
@@ -560,6 +575,7 @@ void main(void)
 	gpio_primary_remap(AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_ON, 0); // enable PA15 (JTDI per default)
 	gpio_clear(GPIO(BUTTONS_READ_PORT),  GPIO(BUTTONS_READ_PIN0)|GPIO(BUTTONS_READ_PIN1)|GPIO(BUTTONS_READ_PIN2)|GPIO(BUTTONS_READ_PIN3)); // pull read lines low since they will be high when driven and button is pressed
 	uint16_t buttons = 0;
+	printf("OK\n");
 
 	encode_morse();
 	bool announce = false;
@@ -655,9 +671,38 @@ void main(void)
 			buttons_new |= ((gpio_get(GPIO(BUTTONS_READ_PORT), GPIO(BUTTONS_READ_PIN1)) ? 1 : 0)<<13);
 			buttons_new |= ((gpio_get(GPIO(BUTTONS_READ_PORT), GPIO(BUTTONS_READ_PIN2)) ? 1 : 0)<<14);
 			buttons_new |= ((gpio_get(GPIO(BUTTONS_READ_PORT), GPIO(BUTTONS_READ_PIN3)) ? 1 : 0)<<15);
-			if (buttons_new!=buttons) { // only do something if there is a change
-				buttons = buttons_new; // save new state
+			uint16_t buttons_diff = buttons^buttons_new; // get difference
+			buttons = buttons_new; // save new state
+			if (buttons_diff) { // only do something if there is a change
 				printf("button pressed: %016b\n", buttons);
+				for (uint8_t number=0; number<LENGTH(numbers); number++) {
+					if (buttons_diff&(1<<numbers[number].up) || buttons_diff&(1<<numbers[number].down)) { // buttons for display 0
+						if (buttons&(1<<numbers[number].up) && buttons&(1<<numbers[number].down)) { // both buttons are pressed
+							numbers[number].number = 0xffff; // disable number
+						} else if (buttons&(1<<numbers[number].up) && buttons_diff&(1<<numbers[number].up)) { // only up button has been pressed
+							if (0xffff==numbers[number].number) {
+								numbers[number].number = 0;
+							} else {
+								numbers[number].number = (numbers[number].number+1)%10000;
+							}
+						} else if (buttons&(1<<numbers[number].down) && buttons_diff&(1<<numbers[number].down)) { // only down button has been pressed
+							if (0xffff==numbers[number].number) {
+								numbers[number].number = 9999;
+							} else if (0==numbers[number].number) {
+								numbers[number].number = 0xffff;
+							} else {
+								numbers[number].number -= 1;
+							}
+						}
+					}
+					// display numbers on TM1637
+					mux_select(number);
+					if (0xffff==numbers[number].number) {
+						led_tm1637_off();
+					} else {
+						led_tm1637_number(numbers[number].number);
+					}
+				}
 			}
 			
 			// display time and frame number